This set of Construction Materials Question Bank focuses on “Carpentry and Joinery – Classification of Joints”.
1. _________________ joints are employed to extend the length of a member by joining two pieces of timber.
a) Lapped
b) Angle
c) Lengthening
d) Bearing
View Answer
Explanation: Lengthening joints are also known as the spliced or longitudinal joints. The method of lengthening will depend on the situation of the member in a frame structure where such joints are commonly required.
2. ___________________ is the simplest form of joint.
a) Lapped joint
b) Framing joint
c) Oblique joint
d) Widening joint
View Answer
Explanation: Lapped joint is form by putting the two Timber pieces one over the other from a short distance and the binding them together by means of iron straps or Stirrups.
3. _________________ straps are provided in case of Lapped joint.
a) Aluminium
b) Nickel
c) Wooden
d) Iron
View Answer
Explanation: The iron straps are provided with bolts on sides for additional strength and in the member as to resist tensile stress, the bolts passing through both the pieces may be provided.
4. In __________ joint, the two Timber pieces are placed touching each other and then wooden or iron fishplate are placed on the opposite faces.
a) Scarfed
b) Spliced
c) Fished
d) Lapped
View Answer
Explanation: In Fished joints, the fish plates are secured in position by bolts passing through the pieces. The bolts are arranged in a zigzag fashion in plan so that there is only one Bolt hole at any cross section.
5. A ___________ joint is formed by making projections and corresponding depression on the other piece.
a) Scarfed
b) Widening
c) Tongued
d) Angle
View Answer
Explanation: In case of Scarfed Joint, the pieces are then secured by using bolts, straps, keys and the metal fish plate. The fish plates used in the joints are usually bent and lent into the wooden members.
6. A _________________ joint present a neat appearance and is useful where depth of beam is to be preserved.
a) Widening
b) Lapped
c) Angle
d) Spliced
View Answer
Explanation: In Spliced or Scarfed Joint, the keys or wedges are of hardwood and they are used to tighten up the joint. Sometimes the use of keys make the provision of bolts unnecessary.
7. _______________ joints are employed to extend the width of board or planks, which are placed edge to edge.
a) Angle
b) Widening
c) Lapped
d) Oblique
View Answer
Explanation: Widening Joints are also known as the side joints or boarding joints and they are used for wooden doors, floors, etc.
8. _________________ are the corner joints which are employed to connect the members at ends so as to form a corner or angular edge.
a) Widening joint
b) Angle joint
c) Oblique joint
d) Corner joint
View Answer
Explanation: Angle joints are very often secured by nailing and glue is used for making these joints. Butt joint, Rebated butt Joint, Tongues joint, Housed joints, etc are some examples of this type of joint.
9. ______________________ joints are employed to connect the members at an angle other than a right angle.
a) Angle
b) Lapped
c) Oblique
d) Bearing
View Answer
Explanation: The angular nodes is made in the incline members. This note is called as Birds mouth. The other members fit into the Birds mouth.
10. In ________ joint, half the thickness of each Timber piece is cut in the shape of dovetail or wedge.
a) Dovetailed
b) Bridle
c) Birdsmouth
d) Mitre
View Answer
Explanation: Dovetailed joint is used when one or both side of the member to be connected are to be flushed on one or both the sides. Whereas, Bridle joint is just the reverse of mortise and tenon joint.
11. The two members meeting at an angle can be joined by a ____________
a) Bridle joint
b) Oblique tenon joint
c) Mitre joint
d) Birds mouth joint
View Answer
Explanation: For inclined members, the mitre joint may be formed on the same line. A mortise is cut in the inclined members and the corresponding Bridle or projection is left in the horizontal member.
12. ______________ joint is used to connect members of bigger sizes.
a) Lapped joint
b) Oblique tenon joint
c) Mitre joint
d) Birdsmouth joint
View Answer
Explanation: The tenon of the inclined member is oblique and it fits into the corresponding mortise of the inclined member. This joint is frequently used in the construction of timber roof and it is sometimes strengthened by means of bolts, straps, etc.
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